Web utility
Web utility
Web front-end toolkit based on TypeScript
Installation
npm install web-utility index.html
<head>
<script src="https://polyfill.web-cell.dev/feature/ECMAScript.js"></script>
<script src="https://polyfill.web-cell.dev/feature/Regenerator.js"></script>
<script src="https://polyfill.web-cell.dev/feature/TextEncoder.js"></script>
<script src="https://polyfill.web-cell.dev/feature/URL.js"></script>
<script src="https://polyfill.web-cell.dev/feature/ScrollBehavior.js"></script>
<script src="https://polyfill.web-cell.dev/feature/IntersectionObserver.js"></script>
</head> tsconfig.json
{
"compilerOptions": {
"module": "ES2021",
"moduleResolution": "Node",
"downlevelIteration": true,
"lib": ["ES2021", "DOM", "DOM.Iterable"]
}
} Usage
CSS Animation
Function Cache
import { cache } from 'web-utility';
const getToken = cache(async (cleaner, code) => {
const { access_token, expires_in } = await (
await fetch(`https://example.com/access_token?code=${code}`)
).json();
setTimeout(cleaner, expires_in * 1000);
return access_token;
}, 'Get Token');
Promise.all([getToken('xxx'), getToken('yyy')]).then(([first, second]) =>
console.assert(
first === second,
'Getting token for many times should return the same before deadline'
)
); DOM operation
import { parseDOM, walkDOM, stringifyDOM } from 'web-utility';
const [root] = parseDOM('<a>Hello, <b>Web</b>!</a>');
var count = 0;
for (const { nodeName, nodeType, dataset } of walkDOM(root)) {
console.log(nodeName);
if (nodeType === Node.ELEMENT_NODE) dataset.id = ++count;
}
console.log(stringifyDOM(root)); // '<a data-id="1">Hello, <b data-id="2">Web</b>!</a>' jQuery-like DOM event delegation
import { delegate } from 'web-utility';
document.addEventListener(
'click',
delegate('a[href]', (event, link) => {
event.preventDefault();
console.log(link.href);
})
); Message Channel
index.ts
import { createMessageServer } from 'web-utility';
createMessageServer({
preset: () => ({ test: 1 })
}); iframe.ts
import { createMessageClient } from 'web-utility';
const request = createMessageClient(globalThis.parent);
request('preset').then(console.log); // { test: 1 } Service Worker updating
import { serviceWorkerUpdate } from 'web-utility';
const { serviceWorker } = window.navigator;
serviceWorker
?.register('/sw.js')
.then(serviceWorkerUpdate)
.then(worker => {
if (window.confirm('New version of this Web App detected, update now?'))
// Trigger the message callback listened in the Service Worker
// generated by Workbox CLI
worker.postMessage({ type: 'SKIP_WAITING' });
});
serviceWorker?.addEventListener('controllerchange', () =>
window.location.reload()
); Internationalization
Migrate to MobX i18n since v4.
Test scripts
If you are looking for a simple alternative of Mocha or Jest, just use these Test Utility methods with ts-node:
npx ts-node index.spec.ts index.spec.ts
import { describe, it } from 'web-utility';
class App {
name = 'test';
static create() {
return new App();
}
}
describe('My module', async () => {
const app = await it('should create an App object', async expect => {
const app = App.create();
expect(app instanceof App);
return app;
});
await it('should init an App name', expect => {
expect(app.name === 'test');
});
}); CSV/TSV Parser
import { FileHandle, open } from 'fs/promises';
import { readTextTable } from 'web-utility';
interface Article {
id: number;
title: string;
}
let fileHandle: FileHandle | undefined;
try {
fileHandle = await open('path/to/your-article.csv');
for await (const row of readTextTable<Article>(
fileHandle.createReadStream()
))
console.table(row);
} finally {
await fileHandle?.close();
}